Definition of underlayment in English:

underlayment

Syllabification: un·der·lay·ment
Pronunciation: /ˌəndərˈlāmənt/

noun

A layer between a subfloor and a finished floor that facilitates leveling and adhesion: the underlayment may be of hardboard or particle board of various thicknesses
More example sentences
  • These products include particleboard used as flooring underlayment, shelves, cabinets, and furniture; hardwood plywood wall panels; and medium density fiberboard used in drawers, cabinets and furniture.
  • Particleboard is made with resins that contain a form of formaldehyde and is found in manufactured home sub-floors, underlayment, cabinets, built-ins, shelving and many other areas.
  • To undercut the door jam, lay a piece of scrap flooring on the underlayment and using that as a guide, saw off the bottom the door jam so the plank will fit.

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